Patent US3522994A successfully refreshed from Google Patents.
US3522994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner
Assignee: Individual
•
Filing: 1968-05-20
•
Granted: 1970-08-04
•
Expires: 1988-05-20
Abstract
No abstract record available.
Inventors
- 👤 Kurt Zenkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:37
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR318601A
Cited
US1090073A
Cited
US1238731A
Cited
GB399789A
Cited
US2300266A
Cited
GB795118A
Cited
US3257682A
Cited
US3284611A
Cited
US3234921A
Cited
US3306336A
Cited
US3398882A
Cited
US3397463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |